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First part of the orderfile generating script refactor. The aim here is to make
sure that all scripts parse the object files the same way, using the same
tool. This commit extracts the parsing logic from patch_orderfile.py. It uses nm
from the Android NDK.

BUG=452879

Review URL: https://codereview.chromium.org/884113002

Cr-Commit-Position: refs/heads/master@{#313528}